Just observations looking at your photos.

Stripes are not original Holden.
Door mirrors not original GM Lukey sports.
Factory would have had those god awful alloy N67 wheels (and should winch cup to match).

Looks to have had all the usual mods of the day. Wagon roof rack, sill plate covers, driving/fog lights, changed wheels, tar babies, Pioneer auto reverse tape deck, big arse under dash knee freezer etc.